P0406 Ford Code - Exhaust Gas Recirculation Sensor 'A' Circuit High
Quick Answer
Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Common causes include Faulty EGR volume control solenoid valve, Carbon built up on EGR valve, EGR volume control solenoid valve harness is open or shorted. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0406 Ford indicates Exhaust Gas Recirculation Sensor 'A' Circuit High.
- Common causes
- Common causes include Faulty EGR volume control solenoid valve, Carbon built up on EGR valve, EGR volume control solenoid valve harness is open or shorted.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0406 Ford Description
The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECΜ. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECΜ does not issue the pulse signal. Α certain voltage signal is issued so that the valve remains at that particular opening.
What are the Possible Causes of the DTC P0406 Ford?
- Faulty EGR volume control solenoid valve
- Carbon built up on EGR valve
- EGR volume control solenoid valve harness is open or shorted
- EGR volume control solenoid valve circuit poor electrical connection
- Faulty EGR temperature sensor and circuit
How to Fix the DTC P0406 Ford?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0406 Ford code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0406 Ford code?
Need more information on how to fix the P0406 Ford code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0406 Ford code diagnosed by a professional: Find a repair shop in your area
Information for Specific Ford Models
- P0406 1997 Ford F150 — Exhaust Gas Recirculation Sensor 'A' Circuit High
- P0406 1998 Ford F150 — Exhaust Gas Recirculation Sensor 'A' Circuit High
- P0406 1999 Ford F150 — Exhaust Gas Recirculation Sensor 'A' Circuit High
- P0406 2000 Ford F150 — Exhaust Gas Recirculation Sensor 'A' Circuit High
- P0406 2001 Ford F150 — Exhaust Gas Recirculation Sensor 'A' Circuit High
- P0406 2002 Ford F150 — Exhaust Gas Recirculation Sensor 'A' Circuit High
- P0406 2003 Ford F150 — Exhaust Gas Recirculation Sensor 'A' Circuit High
- P0406 2006 Ford Fusion — Exhaust Gas Recirculation Sensor 'A' Circuit High
- P0406 2007 Ford Fusion — Exhaust Gas Recirculation Sensor 'A' Circuit High
- P0406 2008 Ford Fusion — Exhaust Gas Recirculation Sensor 'A' Circuit High
- P0406 2009 Ford Fusion — Exhaust Gas Recirculation Sensor 'A' Circuit High
- P0406 2010 Ford Fusion — Exhaust Gas Recirculation Sensor 'A' Circuit High
- P0406 2011 Ford Fusion — Exhaust Gas Recirculation Sensor 'A' Circuit High
- P0406 2012 Ford Fusion — Exhaust Gas Recirculation Sensor 'A' Circuit High
Frequently Asked Questions about P0406 Ford Code
No Frequently Asked Questions about P0406 Ford Code found.
Discuss the causes and fixes for P0406 Ford OBDII Code
-
Have a P0108 and P0406 codes for a 2006 Ford Explorer. It is running a little rough so maybe P0406 is related to the ERG. What's my best approach to get these fixed?
-
Actually both codes could cause the engine to run rough. You should start visual inspect both components (MAP Sensor and EGR Solenoid Valve) and if everything check OK, then clear the codes and check what codes comes back first.
-
2004 Ford expedition 4.6 has a p0406 code installed new dpfe sensor egr solenoid and egr valve what could cause this code?
-
Wow. Unfortunately I have nothing. I also checked a national database of repairs for your model year and the EGR valve is by far the most common problem. Here is the entire list
- Exhaust Gas Recirculation Valve
- Exhaust Gas Recirculation Pressure Sensor Hose
- Exhaust Gas Recirculation Pressure Sensor
- Exhaust Gas Recirculation Valve Gasket
- Vacuum Hose -
2011 ford ranger 4.0 v6 getting code 406, engine is running fine, have replaced egr valve and sensor, still get code when starting after clearing code it runs fine, when turn off engine and restart code reappears
-
Unfortunately, other than the EGR Valve and Sensor I have not seen any other component setting the P0406 code. You could either double check the installation, make sure the connector is firmly connected, or check the wire from the EGR Valve to the Powertrain Control Module (PCM). The Grey wire should have battery voltage, and with the valve connected you should have around 5 Volts at the Violet/White wire.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
